mes/string.c
Jan Nieuwenhuizen 61e42e8527 core: Number based cells.
* mes.c (scm_t): Change car, string, ref, cdr, macro, vector into g_cell index
  [WAS]: scm_t pointer.
* define.c: Update.
* lib.c: Update.
* math.c: Update.
* posix.c: Update.
* quasiquote.c: Update.
* string.c: Update.
* type.c: Update.
* build-aux/mes-snarf.mes Update.
* tests/gc-4.test: New test.
* tests/gc-5.test: New test.
* tests/gc-6.test: New test.
2016-12-12 20:35:18 +01:00

113 lines
2.6 KiB
C

/* -*-comment-start: "//";comment-end:""-*-
* Mes --- Maxwell Equations of Software
* Copyright © 2016 Jan Nieuwenhuizen <janneke@gnu.org>
*
* This file is part of Mes.
*
* Mes is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or (at
* your option) any later version.
*
* Mes is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Mes. If not, see <http://www.gnu.org/licenses/>.
*/
SCM
string (SCM x) ///((arity . n))
{
return make_string (x);
}
SCM
string_append (SCM x) ///((arity . n))
{
SCM p = cell_nil;
while (x != cell_nil)
{
SCM s = car (x);
assert (g_cells[s].type == STRING);
p = append2 (p, STRING (s));
x = cdr (x);
}
return make_string (p);
}
SCM
list_to_string (SCM x)
{
return make_string (x);
}
SCM
string_length (SCM x)
{
assert (g_cells[x].type == STRING);
return make_number (value (length (STRING (x))));
}
SCM
string_ref (SCM x, SCM k)
{
assert (g_cells[x].type == STRING);
assert (g_cells[k].type == NUMBER);
g_cells[tmp_num].value = value (k);
return make_char (value (list_ref (STRING (x), tmp_num)));
}
SCM
substring (SCM x) ///((arity . n))
{
assert (g_cells[x].type == PAIR);
assert (g_cells[car (x)].type == STRING);
SCM s = g_cells[car (x)].string;
assert (g_cells[cadr (x)].type == NUMBER);
int start = g_cells[cadr (x)].value;
int end = g_cells[length (s)].value;
if (g_cells[cddr (x)].type == PAIR) {
assert (g_cells[caddr (x)].type == NUMBER);
assert (g_cells[caddr (x)].value <= end);
end = g_cells[caddr (x)].value;
}
int n = end - start;
while (start--) s = cdr (s);
SCM p = cell_nil;
while (n-- && s != cell_nil) {
p = append2 (p, cons (make_char (g_cells[car (s)].value), cell_nil));
s = cdr (s);
}
return make_string (p);
}
SCM
number_to_string (SCM x)
{
assert (g_cells[x].type == NUMBER);
int n = value (x);
SCM p = n < 0 ? cons (make_char ('-'), cell_nil) : cell_nil;
do {
p = cons (make_char (n % 10 + '0'), p);
n = n / 10;
} while (n);
return make_string (p);
}
SCM
string_to_symbol (SCM x)
{
assert (g_cells[x].type == STRING);
return make_symbol (STRING (x));
}
SCM
symbol_to_string (SCM x)
{
assert (g_cells[x].type == SYMBOL);
return make_string (STRING (x));
}